1/3-(1/9+1/6)=1/3-(4/36+6/36)=1/3-10/36=12/36-10/36=2/36=1/12
(2/3+1/9)-13/18=(6/9+1/9)-13/18=7/9-13/18=14/18-13/18=1/18
3/4-1/2+7/8=6/8-4/8+7/8=9/8
1/8+x=3/5
x=3/5-1/8
x=27/40-5/40
x=22/40
x=11/20
80/100*(100-20)=64
ответ 64во 2 мешке
Решение обоих примеров на фотографии ниже
а) 1/10 + 7/100 = 10/100 + 7/100 = 17/100
б) 21/100 + 1/10 = 21/100 + 10/100 = 31/100
в) 3/5 + 9/10 = 6/10 + 9/10 = 15/10 = 3/2 = 1 1/2
г) 2/3 + 5/6 = 4/6 + 5/6 = 9/6 = 3/2 = 1 1/2
д) 15/24 + 3/8 = 15/24 + 9/24 = 24/24 = 1
е) 7/6 + 16/ 18 = 21/18 + 16/18 = 37/18 = 2 1/18
ж) 1/12 + 1/6 = 1/12 + 2/12 = 3/12 = 1/4
з) 1/2 + 3/10 = 5/10 + 3/10 = 8/10 = 4/5